The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2005
Filed:
Jan. 09, 2004
Evan S. Mccarthy, Costa Mesa, CA (US);
Evan S. McCarthy, Costa Mesa, CA (US);
Skyworks Solutions, Inc., Irvine, CA (US);
Abstract
The invention provides techniques for compensating for current leakage from a loop filter during off times of a PLL between on times of the PLL, e.g., when a cell phone is in paging mode. The leakage current is compensated by providing offsetting charge to ensure that the VCO tuning voltage when the PLL is turned from 'off' to 'on' is at or near the VCO tuning voltage when the PLL is locked (the VCO-lock voltage). Several techniques can be used compensate for the leakage current and several techniques can be used to determine how accurately the leakage current is being compensated for, and what, if any, adjustments to make in the offsetting charge to adequately compensate for the leakage current.